Diffuser



May 3l, 1932. A. GUSTIN DIFFUSER Filed oct. 1, 1929 las IN VEN TUR A TTORNEY 50i drained.

Patented May 31, 1932 s aurons GUsrINl or Oce-Niro FALLS; wlsconsmlassieiroi .l

The present invention relates broadly to diiusers and is more specifically-directed@ the type of diffusery used in the `paper industry for drainingthe digesting liquor' from the 5 WoodI `pulp after the same has been `treated in the digesters; the same diii'userbeingalso usedfor Washing the Wood pulp so as to -f-ree the same of any substantialquantities ofthe digesting.' liquor. l

erally comprise closed tanks of large diniensions someof them being 30. ft. in height and l2 ft. inr diameter. v The Wood pulp-tof. gether with the liquor is fedV or Washed into the difusers from the digester, and the di` gesting liquor is drained'and the Wood pulp is Washed by Water under pressure.` Such diiusers are generally provided -With aper-V forated plate disposed over and spaced `from the bottom of the diffuser andth'eliquor as Well as the Wash liquor is drained through-an outlet at the bottom of the diffuser. A One of the objects ofthe present invention is to provide a diffuser 'of novel construction which will minimize the time Consumed in the draining of the digesting liquor and in "the Washing of the Wood pulpinthe diuser. Other objects Will be'appalrent to; the per-A sons skilled inthe art from thedra-Wings and the specification submittedV herewith.` Inv order toV accomplish this purpose; the diffuser shown and Vdescribed ,herein-Corn prises alateral drainage zone iii-addition to theA bottom drainage zone. with .Which such diffusers are usually provided. .The lateral drainage zone-is preferably disposedA near the bottoni. ofthe tank or diffuser and preferably @Xtends vertiall-y. alone the lateral Wall of thefdiiiuserjfor affraction` of the heightI of. theme19 By these: means drainage takes place atv the bottom of thetank and also'lat several points in the lateral Wall ofthe .tank with the: result .that thQWaShlig 0f theWODd pulp, is accomplished. much; limiterapidly than. by the :use 0f .dilrS knvirll hitherto# Th disposition Off the" lateral drainage: 0.1.16 .ifll the lower portion ofthetank permits the Washl liquor` to`,pas`s1`through substantially the en.-

tire column of Wood pulpbefore the Sffime is Diffusersof the type describedabove gen- 1- Theflateral'drainage zoneisftorineddby mounting. a Elateral lilterplate .agaifnfst.ith,e lower .portion ofthe laterali: vvallff` of` thestarnli, thel filter..v plate being so constructedwthat 4it can` withstandJ the pressuresv existingwithin the dif'nser.; the' flter. plate beingspacedfrom ly annular drainage"chainberz TheL following. f s. a Vdeseriptionzoi'f one Abodirnent of.V the present .invent-ion. Itzfwill be understoodrthatmodificationsandehanges Y maybe. madev Without departing from f the spirit of the invention.andfvvithoutiexceeding thescopefoff'eelaimsf `In the drarvingsiy f A- A Figural is.; aflatenal view? ofy the. diil'usen embodying the presentiinvention. .1 'l tw- '.Figure 2. is' a; planlvielw. olf-the diiuser showingfthe pipingarizangement.. f i? o Figure3is. a longitudinalasectionali.View V showing the?, constructi0n and .arrangement ofthe lateral fiilterj platexivithinzthel diffuser.

ffoif the mixturefof.Woodzpulplandzfdigest- "j ing liquor and a valve inletf12v fonwaterffor anyoth-ervvvash liquor.

. new al@ digestin of f u1@ -wifpaiifi completed: in the. digester, the 1 contents'ot'the.

digester, which .consists of. Wood 2 .pulp rand liquor,is permittedtolflow into'th tankilO Y through lthef .inlet 11, the inlet l2. beiirigi used forA the intro'dfuotion of'. `:Water-2 or! anyoth'en liquor, sueh. as thek Weakiliquzoi ref-f fer-red ltofin' a later portionof tliisspeoiiiqa. tion.l The Wash; liquor 1 may be introduced intofthe diiiuserurid'erfpressure#\ y f f EA perforated platel El'is disposed over: theV bottoni f ofthe .tankA forming the'bottom ldrain-.f1

age Zone :16,- Which'is provided with an outlet' lhej lateral drainage fnone?1'8"is'ipre'JI'fg f erably disposed nearthe'f bottom '0f the'diffuser 10 andis `forinedbyfInounting plate partly, broken detailedy v'ievv isol, 19 on the lateral Wall in such amanner as to form a closed drainage zone which is provided with a plurality of lateral outlets 20.

' v The outlets 2O are all connected together and yto the'conduit 21 and upwardly to approxi-V mately the'level ofthe top of the tank is provided at its upper end with two parallel branches 23 and 24 connected to the upper end of conduit 21. The pipe 25connected to the middle ofA the branch 23'leads to the strong liquor header (not shown), while the pipe26V connects to the Weak liquor header (not. shown) @Valves 40'and 41 aredisposed in branch 23 as kshown and valves 42, 43 are disposed in branch24 .as shown. It will be seen that by means of the piping arrangement shown and describedherein, the. drainage from the two zones may bemade to flow in any manner desired. The liquor from these zones may either ybemade -to flow concurrently'into the .sewer system by openingfall Valves inthe system which will cause the flow of'all of the liquor through the conduitv V22, or, the drainage fromtthe two zones may be made to flow concurrently either into the conduit 25 leading to the strong liquor header or to the conduit26 leadingnto the weak liquor header; and if desired the liquor'froni the two zones may be made to flowseparately, one into the strong liquor header and ythe otherv into the weakliquor header.' d f It will be understood Vthat the.A liquor drained at the begining of the washing operation is strongbothl in zones y16 and 18. At the beginning ofthe washing operation therefore the valves 42"and 43 may be closed and the valves 40 rand 41 opened,atthe'same time maintaining the-valve inoutlet'22 closed. Thiswill cause the liquor from both zones kto flow intothe strong. liquor header.V After the washing.V operation has proceededv for a d substantial lengthof time the drainage liquor from izone 18 will become weak y.while the drainage liquor from Zone 16 remains strong.

Under these conditions if desired the liquor y from' zone 16 may 4be made to flow to the strong liquor header while the drainage from the :zone 18 maybe made to flow to the weak Y liquor header.

liquor in both Zoneswill be weak, and if vde-r This is accomplished by closing valve 40 and opening valve 42. After the washing has proceeded a little further the sired the liquor from both zones .maybe then made to flowV tothe Vweak liquor header by closing valve 41 andl maintaining valve 40 i closed and by opening valve'43 and maintaining valve42 open.` Aftery the lwashingjhasr progressed toxthe extent ythat the drainage liquoris so weak that it is notdesirable toV store the saine ineither. the weak or strong liquor headers, it may be caused to iow out through the outlet 22. Y

The drainage zone 18, which if desired, may be made to constitute an annular chamber around the entire internal circumference of the tank, is preferably sojconstructed that itdoes not quiteextend` entirely around the Y plate in .that it faces interiorly` of the tank While theplate 27 is a backing plate.,-A reticulated plate 29 is interposed between. the

plates 27 and 28. The edges of the plates are4 held together by means of the binder straps 30and rivets 31. The horizontal as well as the vertical edges of the adjacent s'ecti'onsfare joined 4by lmeans, of the L-shaped angle irons L31, whichk are in turn riveted by means of the rivets 32 which pass throughlthe binder straps 30 and the angle rirons 31. rIl "he adja-V cent edges of thebinder straps 30 are welded as shown at 33.rk The L-shaped angle irons 1 31 are preferably y provided with. vertical openings to provide vertical passages forthe liquor that is being drained.` i

The drainagezone 18 is closed at the upper and lower edges of theplate 19 by means of the bars 34 to which the L- shaped angle irons 35V are bolted. The` inner edges of the plates 34 are preferably welded against the wall of the tank as shown at 36. In order to give the sections of the plate 19 additional rigidity T-shaped angle irons 37 are disposed between the plate'19 andthe wall of the tank, theseY angle irons alsoV being provided with vertical passages 38.

- The vertical endsk 39 are closed vinthe same manneras the horizontal upper md lower edges of the zone 18, i.

While Ihave illustrated and described one preferred fornirk of my invention itis under#v stood that the invention may be embodied in other structures. Ido not, therefore, desire to limit lmyselfl to thev specific: construction,

shown." f I'Yclaim:

wood pulpfcomprising a closed ltank having ak lateral. drainage zone and va bYottf/jm:r drainage zone,|said zones being. non-'communica-v tive interiorly of thetank, a'paino'f discharge conduits, and means fordraining said zones 13.0

concurrently through the same conduit or throu 'h separate conduits as desired.

2. i Wood pulp diffuser, comprising a closed tank, having a foraminous plate disposed over and spaced from the bottomV of said tank and forming a bottom drainage zone, an `outlet from said bottom drainage Zone, a lateral foraminous plate spaced from the lateral Wall of said tank and forming a lateral drainage zone, an outlet from said lateral drainage zone, a pair of discharge conduits, and meansfor causing the drainage zones to discharge simultaneously to either conduit or to separate conduits.

3. A Wood pulp diffuser, comprising a closed tank, having a foraminous plate disposed over and spaced from the bottom of said tank and forming a bottom drainage Zone, an outlet from said bottom drainage zone, a lateral foraminous plate spaced from the lateral Wall of said tank and forming a lateral drainage Zone, an outlet from said lateral drainage zone, a pair of'discharge conduits, and means whereby said zones may be drained concurrently through the same conduit or through separate conduits, orindividually through either conduit.

4. A Wood pulp diffuser comprising a closed tank, and a filter plate carried by the lateral Wall of said tank, said plate comprising a reticulated body, a perforated facing plate and another perforated backing plate;

5. A VWood pulpV diffuser comprising a closed tank, and a filter plate carried by the lateral Wall of said tank, said plate comprising a reticulated body, a facing plate having relatively small perforations, and a backing plate having relatively large perforations.

In testimony whereof I have aliXed my signature to this specification.

ANToNE GUSTIN. 

